The document discusses the levels of an activity-based costing (ABC) system. It explains that under ABC, costs are first assigned to activities and then traced to products. There are four levels of costs: unit, batch, product, and facility. Unit costs are directly proportional to the number of units produced. Batch costs are proportional to the number of batches produced regardless of batch size. Product costs can be traced to a product line. Facility costs are incurred for the plant as a whole and cannot be traced to specific units or products. The document provides examples for each cost level.